Spring sash balance



Sept. 14 1926. 1,599,872 J. BRAEN SPRING SASH BALANCE Filed Feb. 17, 1923 2 Sheets-Sheet 1 gwoentoz Sept. 14 1926. 1,599,872

J. BRAEN SPRING SASH BALANCE Filed Feb. 17 1923 2 Sheets-Sheet 2 lt atented .Fzept. id, 19265.

J'QIIN BRAEN, OF E-IAVITEZGRNE, NEW" JERSEY.

SPRING BALANCE.

Application filed February 1! Serial No. 619,647.

This invention relates to an improved sash balance .and has for its prime object to provide a sash which is automatically balancet atany degree at which the window is opened.

A further object of the invent-ion is to provide a sash balance which will dispense with the .sliding weights.

A still further object of the invention is to provide a window sash balance which can be installed in position without cutting the jamb to allow for installing or repairing same, which often tends to weaken the amb where the most strength is necessary.

And a still further object of the invention is to provide a sash balance of the above indicated character, which is simple in con struction, durable, efficient for the purpose intended, and one that can be easily and quickly installed at a very low cost.

These and like objects of the invention will be better understood as the cescription follows and as is specifically pointed out in the appended claim.

Referring to the accompanyingdrawings, which form a part of this specification,

Figure l is a front elevation of a window showing my device in dotted lines applied thereto.

Figure 2 is an enlarged detailed view of the sash balance.

Figure 3 is a sectional View taken on line 33 of Figure 2, looking in the direction of the arrows.

Figure e is an enlarged side elevation of one of the spring drums.

Figure 5 is a vertical section through same, and

Figure 6 is a detailed view of the supporting brace for the spring drums.

In the drawings, the numeral 1 indicates a window frame having supported therein an upper sash 2 and a lower sash 3. A plate l is secured by means of screws or any other suitable fastening elements to the underside of the head jam 5 of the frame 1. The head jam 5 is provided at one side edge thereof and at a point midway between its ends with a recess 5 through which extend spring drums 6, of which there are two, and which are supported by the plate 4-. Each of the spring drums is provided with grooves 7 for receiving thereon a cord 8. A U- shaped bracket 9 has its free ends bolted to the upperside' ofthe plate 4:, and the intermediate portion of the U-shaped bracket passes over the spring drums 6, A shaft 10 passes through the bracket 9, centrally of each otthe spring drums and is locked therein by a ratchet 11 keyed to the shaft 10st a point below the plate l. The extreme end of the shaft 10 is provided with a square portion 12, so that a key may be employed for winding a spring 18 to the desired tension for the balancing of one of the sashes within the window frame. One end of the spring is secured to the shaft 10 as at let, while the oposite end of the spring is secured as at 15 to the drum .6. A locking pawl 16 is pivoted to the plate 4 and the free end of same engages the ratchet 11.

The cords 8 which are attached to the upper sash 2 by means ofeyes 17 seated in recesses formed in the top or sides of the upper .sash, are adapted to pass over pulleys 18 in the head jamb at each end thereof and the free encs of each of the cords are secured to one of the drums 6 on opposite sides as at 19, while cords 8 carried by the opposite drum are adapted to engage the lower sash as is shown in Figure 1.

In order to properly balance the sashes,

we will take for example the upper sash. It

can be readily seen that when the sash is moved downwardly within the frame, the cord 8 which is wrapped around the drum will cause the drum to rotate, du *ing which operation tension will be applied to the spring 13, so that when the window is released from downward pressure, the spring will be wound to such a tension that same will balance the weight of the sash. It will also be readily seen that by having the spring under tension, the same will greatly assist in closing the sash.

In view of the foregoing description of my invention taken in connection with the accompanying drawings, it is thought that any further explanation as to the construction, operation and objects of my invention is unnecessary.

While I have shown and described the prefered form of my invention, I realize that various minor changes may be resorted to, without departing from the spirit and scope of the invention as claimed, and therefore, I do not wish to limit myself to the exactdetails of construction shown, nor to the combination and arrangement of parts.

What I claim as new and desire to secure by Letters Patent is:

A sash balance structure comprising a head jamb provided at its side edge and at a point midway between its ends with a recess, a pair of pulleys journaled at each end portion of the head jalnb, a frame disposed across the recess and extending parallel With the longitudinal edges otthe recess and the head jamh, a pair of shafts jonr naled in the frame and disposed at right angles to the plane of the head jainb and having their axes located one at each side of the median longitudinal dimension of the frame and the head jainb, substantially cone shaped drums mounted upon the shafts and disposed above the head janib, coil springs connected with the drains and the shafts, means for holding the shafts against reverse turning movement and cables arranged to Wind upon the drums and trained over the pulleys located at the end portions of the head jainb.

In testimony whereof, I have affixed my 20 si gnatnre.

JOHN BRAEN. 

